Automatic mixers for drums, small tankers, movable tanks, with motorized lift and descent, with all safety systems, including the start only in presence of the drum and propeller lowered, with operator at a safe distance. Mechanical lifting with rack and pinion gearbox, possibility of agitation at speeds variable mechanically or electronically, marine propellers double-blade, triple-blade, or notched cowless for all mixing needs including dispersion of dust or loads within the material.